This is one of those cultural memes ("The Top Gun landing was ImPoSsIbLe") that tells on the person saying it for not having read the manual. If you don't read the manual, the landing sequence is pretty much impossible to figure out. If you do, you pretty much get it the first and every time after that.
That said, this is bad game design. A manual should never be needed.
That's going too far.
Also, we're talking about the 8-bit era: 1) technical limits prevented a lot of in-game exposition that you could do now and 2) before the internet, people had fewer options for reading material. I read every manual for every NES and SNES game I ever had, multiple times. If I was into a game my options were limited to 1) play it, 2) read the manual if I couldn't play it (e.g. if I wasn't at home or not allowed to take over the TV to play).